| 摘要 |
PURPOSE:To hold a superconductive field coil firmly and to increase a cooling effect for prevention of the superconductivity destruction by winding a spiral insulation spirally around a superconductive wire of the superconductive field coil, by making a regrigerant cooling pass in a space of the spiral insulation and by putting a cylindrical body on a coil installation shaft. CONSTITUTION:Liquid helium is supplied through a cooling pass 2a formed around a coil installation shaft 2, and it flows into a cooling pass 30a made of an insulating material in a slot and into a cooling pass 29a for an upper insulating material 29. The liquid helium then flows into a cooling pass 29b and then into a cooling pass 27 formed on a superconductive wire 25a by a spiral insulation 26 after passing through a cooling pass 29c, to cool the superconductive wire 15a directly. Thus a cooling effect is raised and a reliability is increased without the destruction of superconductivity. What's more, a cylindrical body 31 is put on the coil installation shaft 2 to hold a superconductive field coil 25 set in a slot 18 firmly in the slot 18.
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